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  #1  
Old 03-08-2013, 11:34 AM
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Default Semi Auto MG34 Build



Hot on the heels of my Vickers MMG build here is my next project, Semi auto MG34. Using a very nice kit I came across and a doner receiver I will reweld and convert to semi.

Last edited by Kiwi; 03-09-2013 at 12:13 PM..
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Old 03-09-2013, 12:15 PM
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I will be using TNW semi parts and plans
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Old 03-09-2013, 12:17 PM
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And welding up the top receiver. I was going to rebuild the bottom receiver that was given to me, however decided to find a replacement. It was going to take to long and way more work to rebuild this. I found the top one at IMA.
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Old 03-09-2013, 3:06 PM
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First I need to salvage some parts off the other receiver. As you can see it would very difficult to rebuild this receiver.
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Old 03-09-2013, 3:07 PM
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Salvaging more parts
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Old 03-09-2013, 3:08 PM
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This pin is held in by a cross pin, once that is removed you can press it out.
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Old 03-09-2013, 4:21 PM
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I like to start getting rid of the full auto features as soon as possible. This is the full auto trip which gets simply ground down.
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Old 03-09-2013, 4:22 PM
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Here it is removed
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Old 03-09-2013, 4:24 PM
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We also do not need this lever with the semi conversion
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Old 03-09-2013, 4:25 PM
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So we just take it out. I will put the bolt conversion to the side while I work on getting the receiver cleaned up and re-built. I will use the bolt for test fitting but will finish the semi auto conversion later.
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Old 03-09-2013, 5:04 PM
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On to cleaning up all the slag left over from demill
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Old 03-09-2013, 5:07 PM
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As you can see the cuts are bad. At this point I dont care about the actual cuts just the inside and outside. I need to file those edges flat so that the bolt and bolt carrier slide freely through the entire receiver.
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Old 03-09-2013, 5:10 PM
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Here you can see the bolt and carrier moving freely through the receiver sections.
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Old 03-09-2013, 5:12 PM
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And the back section. I am using the charging handle to help hold things in place. It also needs to be fitted and slide freely.
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Old 03-09-2013, 5:13 PM
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And the front section
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Old 03-09-2013, 5:15 PM
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This shows me checking the bolt with the front section. I am using the feed tray to hold the sections together. It also shows that the front section probably came from another receiver good news for us.
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Old 03-09-2013, 5:26 PM
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Dont forget the reciprocator hole. I filed it out then drilled it to the right size.
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Old 03-09-2013, 5:39 PM
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Cool project man!
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Old 03-09-2013, 5:40 PM
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thanks....
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Old 03-09-2013, 9:06 PM
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Tagged for pure awesomeness...
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Old 03-10-2013, 12:03 AM
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are you going to put a lock on the cover or a fin on the p/g?
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Old 03-10-2013, 3:30 AM
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I will be making a custom bullet button and semi permanent drum
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Old 03-11-2013, 11:17 AM
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Next we need to made modifications to the receiver so that full auto parts can not be installed. Here you can see the underside of the reciever. I laid the new semi auto sear in place and marked where I need to start filling from. You can make an insert or just fill the area with weld. I am going to do both. I will make an insert or inside the receiver and weld up the areas on the outside.
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Old 03-11-2013, 11:19 AM
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The notch at the bottom has to be filled. You could just weld up 1 inch or so of it but I am going to make a real quick insert. This will stop an unmodified bolt or full auto bolt and carrier from being installed.
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Old 03-11-2013, 11:20 AM
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This is the super quick insert I made
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Old 03-11-2013, 11:21 AM
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and here it is sat down inside the receiver and blocking the slot
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Old 03-11-2013, 11:26 AM
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Very cool

I had a TNW 34 for a couple of years. It was a beast. When I first got it the sear ring (what I call it) that goes on the bolt, that hold the lever that is triped by the trigger was way to soft. Once it got worn, it caused slam fires...at that point since the ring was no long catching the lever, it turns it in to a fixed firing pin and when the bolt falls....needless to say it was a range shocker when belt was dumped before I could twist the belt to stop it.

TNW sent me some replacements and they worked out fine. I made it a habbit to pull the bolt to inspect that ring before taking it out to the range or reenactments.
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Old 03-11-2013, 11:27 AM
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And here it is from the other side. Now I can weld up the rest of it. Now with welding I will tell you I am a hobby welder at best. I am ok so please dont judge my welding till you see the finished project.
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Old 03-11-2013, 11:29 AM
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Quote:
Very cool

I had a TNW 34 for a couple of years. It was a beast. When I first got it the sear ring (what I call it) that goes on the bolt, that hold the lever that is triped by the trigger was way to soft. Once it got worn, it caused slam fires...at that point since the ring was no long catching the lever, it turns it in to a fixed firing pin and when the bolt falls....needless to say it was a range shocker when belt was dumped before I could twist the belt to stop it.

TNW sent me some replacements and they worked out fine. I made it a habbit to pull the bolt to inspect that ring before taking it out to the range or reenactments.
Very interesting....I will have to keep my eyes open on that. This is a very fun build. I am finding that they made these guns to last a life time.
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Old 03-11-2013, 11:32 AM
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Great project, I will be following with great interest.
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Old 03-11-2013, 11:35 AM
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Since it is a striker fired closed bolt, that lever holds the firing pin back under spring load. If that ring edge gets worn, that lever will slip off and drop the firing pin and spring instead of holding the fireing pin back in the cocked position. Once you start on the bolt you will see what I mean.

I had 2 extras in my gunners kit at all times. When I sold it to a fellow Calgunner I sent them to him. TNW replaced my orginal for free and sold me spares for $10 each if I remember correctly.
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Old 03-11-2013, 11:51 AM
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I have gone over the bolt conversion and it seems pretty straight forward. On most of the semi auto conversions I do it is some form of striker. I have an SG43 and DP28 im trying to figure out a striker fired system for. But thanks for the heads up on the wear to those parts once she is all up and working I will invest in some spares.
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Old 03-11-2013, 11:53 AM
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Now you can see the areas that need to be filled. I use short welds to control the ammount of heat so that i dont warp the receiver You can see brass rods and plate in ares to control where the weld fills.
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Old 03-11-2013, 11:55 AM
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I put a small filler piece in before I weld this hole up
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Old 03-11-2013, 11:57 AM
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Once you have filled this section grind then file flat and smooth.
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Old 03-11-2013, 12:06 PM
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Now on to making a welding jig. Here is some of the material I will use.
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Old 03-11-2013, 12:10 PM
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Excellent
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Old 03-11-2013, 1:58 PM
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Very nice! One of the most fun builds I have done. You'll enjoy it quite a lot.

About the gun, I believe you can just take off the stock and leave in the buffer tube to make it non-shoulderfiring. Then no bullet button needed.
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Old 03-11-2013, 2:23 PM
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Quote:
Very nice! One of the most fun builds I have done. You'll enjoy it quite a lot.

About the gun, I believe you can just take off the stock and leave in the buffer tube to make it non-shoulderfiring. Then no bullet button needed.
It would be the same to make spade grips for it. I actually have in an r&d phase spade grips for the MG42/M53/MG3 belt feed guns. I know they were not used on the WWII guns but they did have a spade grip on the MG3 guns used on helo's.
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Old 03-12-2013, 1:46 PM
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Tagged,i want to see this work... It must be pretty nice


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